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 Post subject: Question about a problem #1 Posted: Wed Dec 20, 2017 1:41 pm
 Dies with sente

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Graded Go Problems for Beginners Volume 3, problem 300

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | . O X O . . . .\$\$ | . . . O X X . .\$\$ | . . . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

Black to kill.

The given solution is :

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | 3 O X O . . . .\$\$ | . . 2 O X X . .\$\$ | . 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

However, surely if White plays :

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | . O X O . . . .\$\$ | . 2 . O X X . .\$\$ | . 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

Then there would be no way for Black to kill.

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | 3 O X O . . . .\$\$ | 4 2 6 O X X . .\$\$ | 5 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | . O X O . . . .\$\$ | . 2 5 O X X . .\$\$ | 4 1 3 O O X . .\$\$ | . . 6 . . . . .\$\$ +----------------[/go]`

Is there some variation I'm missing?

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 Post subject: Re: Question about a problem #2 Posted: Wed Dec 20, 2017 2:19 pm
 Honinbo

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mongus wrote:
However, surely if White plays :

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | . O X O . . . .\$\$ | . 2 . O X X . .\$\$ | . 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

Then there would be no way for Black to kill.

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | 3 O X O . . . .\$\$ | 4 2 6 O X X . .\$\$ | 5 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

`[go]\$\$B \$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | . O X O . . . .\$\$ | . 2 5 O X X . .\$\$ | 4 1 3 O O X . .\$\$ | . . 6 . . . . .\$\$ +----------------[/go]`

Is there some variation I'm missing?

is the key.

_________________

At some point, doesn't thinking have to go on?

I think it's a great idea to talk during sex, as long as it's about snooker.

— Steve Davis

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 Post subject: Re: Question about a problem #3 Posted: Wed Dec 20, 2017 2:25 pm
 Lives in gote

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Another hint,
Look for some liberty shortage

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 Post subject: Re: Question about a problem #4 Posted: Wed Dec 20, 2017 3:31 pm
 Dies with sente

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Ah yes, think I've got it :

`[go]\$\$B\$\$ | . . . . . . . .\$\$ | . X . . . . . .\$\$ | . . X X X . . .\$\$ | X X O O . . . .\$\$ | X O X O . X . .\$\$ | 4 O X O . . . .\$\$ | 3 2 . O X X . .\$\$ | . 1 . O O X . .\$\$ | . . . . . . . .\$\$ +----------------[/go]`

Of course, White cannot play 4.

I really struggle to read out liberty shortage problems. Thanks for the hints!

 This post by mongus was liked by: Bill Spight
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